A number is increased by 20% and then decreased by 20%. The resulting number is 20 less than the original. Find the original number. MCQ with Answer and Explanation

Question

A number is increased by 20% and then decreased by 20%. The resulting number is 20 less than the original. Find the original number.

A. 500

B. 450

C. 550

D. 400

Answer: Option A

Solution (By JKSSB Mock Tests)

1.2×0.8=0.96, 0.96x = x - 20 → 0.04x=20 → x=500.

This question belongs to: Maths Percentage

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Question #1

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Machine depreciates 15% per year. Present value Rs. 72,250, value 2 years ago was:

A. 95,000

B. 1,00,000

C. 1,05,000

D. 90,000

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Correct Answer: Option B

Explanation:
Value 2 years ago = 72250 / (0.85×0.85) = 72250 / 0.7225 = 1,00,000.

This question belongs to: Maths Percentage

Question #2

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Weight reduced from 90 kg to 81 kg. Percentage decrease:

A. 11%

B. 9%

C. 8%

D. 10%

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Correct Answer: Option D

Explanation:
Decrease = 9 kg, (9/90)×100 = 10%.

This question belongs to: Maths Percentage

Question #3

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72% passed an exam. Failures = 560. Total examinees:

A. 2500

B. 2200

C. 1800

D. 2000

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Correct Answer: Option D

Explanation:
28% = 560, total = 560/0.28 = 2000.

This question belongs to: Maths Percentage

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